Uncle Sam's ugly faces.

U.S. unilateral withdrawal from the ABM treaty.
The U.S. Exit From the Anti-Ballistic Missile Treaty Has Fueled a New Arms Race.

In 2018, Russian President Vladimir Putin gleefully unveiled a range of new developmental nuclear delivery systems—an intercontinental hypersonic glider, a nuclear-powered cruise missile, and a nuclear-powered torpedo—that he stated were a response to the demise of the ABM Treaty. History appears to back him up. The glider, which has now been deployed, was first tested in about 2004—just two years after the U.S. withdrawal took effect.

China is following suit. It has armed some ICBMs with multiple warheads. This summer, it conducted two tests of an orbital weapon capable of delivering a hypersonic glider (an unpowered reentry vehicle that glides in the atmosphere faster than five times the speed of sound). U.S. officials have stated that China is "looking at" nuclear-powered delivery systems. In 2020, the U.S. general who was then responsible for defending North America argued that China's aim is to ensure that, after absorbing a preemptive U.S. attack, its surviving nuclear weapons can penetrate U.S. defenses.

https://carnegieendowment.org/2021/12/13/u.s.-exit-from-anti-ballistic-missile-treaty-has-fueled-new-arms-race-pub-85977